blue_fusion
If there was any chance to make my cards look like a Lynyrd Narciso deck I wouldn't hesitate But no way ...
Thanks for mentioning MPC. Wow, they even offer hexagonal cards.
And I second Islamic iconography. It would definitely be worth digging into it. I already have a couple of books about the mathematical foundation of arabic patterns (maybe only suitable for my formalistic take on the whole thing of course).
Ha! And I already started reading English and German translations of the Mystic Rubayat too, in search of possible texts for the blue patches on the cards. But after all in my deck at least there won't be any blue patches.
I think MPC charges around $50 additional for odd dimensions (I got that from the creator of the Mutations deck) - this isn't per deck, I think, but covers the entire order of decks - I think it's to pay for the cusyom die-cut blade for the cards (I had a similar experience with the Marcelino. The diecut charges were quite a bit more than that!).